坡面草被覆盖对坡沟侵蚀产沙过程的影响
收稿日期: 2004-08-02
修回日期: 2004-12-28
网络出版日期: 2005-09-25
基金资助
国家自然科学基金委员会、黄河水利委员会联合资助基金项目 (50239080)
Impact of Different Grass Coverages on the Sediment Yield Process in the Slope-gully System
Received date: 2004-08-02
Revised date: 2004-12-28
Online published: 2005-09-25
Supported by
Joint Fund of National Natural Science Foundation of China and Yellow River Conservancy Commission, No.50239080
李勉, 姚文艺, 陈江南, 丁文峰, 杨剑锋, 李莉, 杨春霞 . 坡面草被覆盖对坡沟侵蚀产沙过程的影响[J]. 地理学报, 2005 , 60(5) : 725 -732 . DOI: 10.11821/xb200505003
By scouring experiments, the changeable process and characteristics of sediment yield in the slope-gully system with different coverages and spatial location of grass were studied. Results showed that the sediment yield decreased with increasing grass coverage at smaller water inflow rates in scouring experiments. The sediment yield with different grass locations on the sloping surface was in the order of upper > middle > lower. At larger water inflow rates, the differences of sediment yield among various grass coverage were enlarged, whereas the changeable tendency of sediment yield with different grass locations on the sloping surface was not very obvious. The proportion of sediment yield from the gully increased in an exponential relationship with increasing grass coverage, and the increasing degree for large water inflow rate is larger than that of the small one. When the grass was located on the lower position on sloping surface, the influence for accelerating gully erosion is the largest. The changeable process of sediment yield in slope-gully system was to increase first and then to decrease.
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